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Taiwan Semiconductor Corporation SA15CH
- Part No.:
- SA15CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA15CH.pdf
- Description:
- 500W, 18.6V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,542
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Product details
Overview
SA15CH from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 15V working stand-off voltage (VWM), 16.7–20.4V breakdown voltage (VBR @ 1mA), and 26.9V maximum clamping voltage (VC) at 19.5A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge immunity in power line and signal path protection.
For engineers reviewing the SA15CH datasheet, SA15CH pinout, SA15CH application, or SA15CH equivalent, this device is selected for high-reliability DC power rail protection where fast response (<1.0ps), low leakage (<1μA @ 15V), and stable clamping under 10/1000μs transients are critical - especially in automotive body control modules, LED drivers, and industrial sensor interfaces.
Technical Context
The SA15CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (16.7–20.4V), clamping transients to ≤26.9V at 19.5A. Its junction temperature rating extends to +175°C, supporting under-hood automotive deployment without derating up to 125°C ambient.
It exhibits <1μA reverse leakage at 15V VWM and a 16 mV/°C VBR temperature coefficient, enabling predictable overvoltage threshold behavior across wide thermal ranges. The device meets IEC 61000-4-2 ESD (±30kV contact) and IEC 61000-4-4 EFT requirements when applied with proper PCB layout and trace inductance control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12V automotive systems. |
| VBR @ 1mA | 16.7–20.4 V - Breakdown voltage range at 1mA test current; ensures reliable turn-on above nominal system voltage with margin. |
| VC @ IPPM | 26.9 V at 19.5 A - Clamping voltage during 10/1000μs surge; limits downstream IC stress to sub-27V during 500W transient events. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; supports ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges. |
| IR @ VWM | <1 μA - Reverse leakage at 15V; minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near heat sources (e.g., power MOSFETs) in engine control units. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads, UL 94V-0 molding, and JESD201 Class 2 whisker resistance. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking. Cathode terminal is marked by a colored band; anode is unmarked end. Leads are pure tin-plated, solderable per J-STD-002, and rated for 70A non-repetitive forward surge (8.3ms half-sine).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / transient return path | Connected to ground or low-impedance return plane; must be routed with minimal inductance to maintain clamping effectiveness. |
| Cathode (banded end) | Protected line connection / surge sink node | Connected to the line being protected (e.g., 12V rail); clamps to anode when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, HTRB, and mechanical shock per Rev G standard. |
| 500W 10/1000μs surge capability | Withstands repetitive load dump pulses (ISO 7637-2 Pulse 5a) without degradation when mounted on 10×10 mm copper pads. |
| Clamping voltage ≤26.9V at 19.5A | Ensures protected ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings during worst-case transients. |
| Response time <1.0ps | Enables suppression of nanosecond-scale ESD events before sensitive gate oxides experience overstress. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for automotive Tier 1 supply chain requirements. |
Applications
| Automotive Power Rail Protection | LED Driver Overvoltage Suppression |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream fuse, clamping transients before they reach PMIC or MCU input rails. Use Value: Limits peak voltage to ≤26.9V during 500W surges, preventing latch-up or permanent damage to 3.3V/5V logic supplies downstream. |
Use Scenario: Constant-current LED driver in headlamp module subjected to ESD and inductive kickback from relay switching. IC Role / Device Role / Timing Role: TVS connected across LED string output terminals to absorb reverse polarity transients and ESD events. Use Value: Sub-1μA leakage avoids current drift in precision current sources; fast <1.0ps response prevents LED driver IC failure during ±30kV contact discharge. |
| Industrial Sensor Interface Protection | DC Motor Control Board Input Protection |
Use Scenario: 4–20mA analog sensor interface in factory automation exposed to cable-induced EFT bursts (IEC 61000-4-4). IC Role / Device Role / Timing Role: SA15CH placed at connector entry point, shunting transients to local ground before signal conditioning op-amps. Use Value: 26.9V clamping ensures op-amp inputs (rated to ±36V) operate within safe common-mode range during 4kV EFT bursts. |
Use Scenario: H-bridge motor driver board receiving 24V DC input, subject to inductive flyback from brushed DC motor commutation. IC Role / Device Role / Timing Role: TVS installed across main power input terminals to clamp flyback spikes generated during PWM switching. Use Value: 500W rating handles repeated 100–200A inductive spikes; DO-15 package allows direct mounting near input connectors with minimal trace length. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same VWM (15V), but bidirectional; higher VC (24.4V @ 21.0A); lower PPK (400W); SMA package (SMT). | Requires PCB redesign for SMT footprint; unsuitable for unidirectional-only layouts needing polarity-specific clamping. | Select SMAJ15A only if board space constraints mandate SMT and bidirectional protection is acceptable. |
| P6SMB15AH | Unidirectional, same VWM (15V), slightly higher VC (25.1V @ 20.0A); same DO-15 package; AEC-Q101 qualified; 600W rating. | Higher surge rating allows margin for extended pulse durations; identical pinout and mounting. | P6SMB15AH offers 20% higher peak power and matches SA15CH's form, fit, and function - preferred for new designs requiring extended surge headroom. |
Compared with SMAJ15A and P6SMB15AH, SA15CH provides AEC-Q101 compliance in a proven DO-15 through-hole package with optimized 26.9V clamping for 12V automotive rails, while offering tighter VBR tolerance than legacy SMB variants and lower leakage than many competing 500W TVS diodes.
Availability
SA15CH is available at Aetrix Electronics and suitable for automotive electronics, LED lighting systems, and industrial sensor interfaces requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SA15CH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 certification capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing robust clamping performance, high-temperature reliability, and compliance with ISO 7637 and IEC 61000 standards in axial-leaded packages.
FAQ
What is the clamping voltage of SA15CH at its rated peak pulse current?
The SA15CH has a maximum clamping voltage (VC) of 26.9 V at 19.5 A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value ensures protected circuitry remains within safe operating limits during ISO 7637-2 Pulse 5a load dump events. The SA15CH datasheet confirms this parameter in the "Maximum Ratings and Electrical Characteristics" table.
Is SA15CH unidirectional or bidirectional, and how is polarity identified?
The SA15CH is a unidirectional TVS diode, with cathode identified by a distinct color band on the DO-204AC (DO-15) package body. The banded end connects to the protected line (e.g., 12V rail), while the unmarked end connects to ground. Bidirectional variants in the SA series use "CA" suffixes (e.g., SA15CA), not "CH".
Does SA15CH meet AEC-Q101 qualification, and what does the "H" suffix indicate?
Yes, SA15CH is AEC-Q101 qualified - the "H" suffix explicitly denotes compliance with the AEC-Q101 stress test standard for discrete semiconductors. This includes testing for temperature cycling, high-temperature reverse bias, and mechanical shock, making SA15CH suitable for automotive powertrain and chassis applications.
What is the maximum junction temperature and thermal derating behavior of SA15CH?
The SA15CH has a maximum junction temperature (TJ) of +175°C and follows the pulse derating curve in Figure 2 of its datasheet: peak power drops linearly from 500W at 25°C ambient to ~300W at 100°C ambient. Derating is required above TA = 25°C, and thermal design must ensure junction temperature stays within limit under worst-case surge repetition.
How does SA15CH compare to SA15A in terms of breakdown voltage and application suitability?
The SA15CH has a VBR range of 16.7–20.4 V (min/max at 1mA), while SA15A specifies 16.7–18.5 V - a tighter tolerance. SA15CH is AEC-Q101 qualified ("H" suffix); SA15A is not. For automotive applications requiring qualification and broader VBR tolerance, SA15CH is preferred; SA15A suits cost-sensitive industrial uses where qualification is unnecessary.
SA15CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA15CH FAQ
1.How can I place an order for SA15CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA15CH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA15CH reliable?
The price and inventory of SA15CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA15CH is usually 5 days.
3.What payment methods are accepted for SA15CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA15CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA15CH?
SA15CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA15CH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA15CH?
For technical support, including SA15CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA15CH requirements.
6.How does Aetrix verify that SA15CH is sourced from the original manufacturer or authorized distributors?
All SA15CH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA15CH meets industry standards.
7.What is the process for return or replacement of SA15CH?
All SA15CH units undergo pre-shipment inspection (PSI). If there is an issue with SA15CH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA15CH part is unused and in its original packaging.
Return procedure for SA15CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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